blasphemy

Saying offensive things about God or religion is blasphemy. Blasphemy can be used for offensive ideas in other areas too.

If you're saying something bad about a god, or taking the Lord's name in vain, or questioning a religious institution in any way, you could be accused of blasphemy — insulting something sacred. You can use this word in a lot of other ways too. At a meeting of conservatives, a liberal idea could be considered blasphemy (and vice versa). You might even jokingly cry "Blasphemy!" if a friend said your favorite ice cream flavor stinks.

Definitions of blasphemy
1

n blasphemous language (expressing disrespect for God or for something sacred)

Type of:
discourtesy, disrespect
an expression of lack of respect
profanity
vulgar or irreverent speech or action

n blasphemous behavior; the act of depriving something of its sacred character

Synonyms:
desecration, profanation, sacrilege
Type of:
irreverence, violation
a disrespectful act